<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>用户登录</title>
    <style>
        @import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Noto Sans SC', sans-serif;
        }

        body {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            color: #333;
        }

        .login-container {
            width: 100%;
            max-width: 400px;
            padding: 40px;
            background: rgba(255, 255, 255, 0.95);
            border-radius: 15px;
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
            position: relative;
            overflow: hidden;
        }

        .login-container::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0) 70%);
            z-index: 0;
            animation: pulse 8s infinite alternate;
        }

        .login-header {
            text-align: center;
            margin-bottom: 30px;
            position: relative;
            z-index: 1;
        }

        .login-header h1 {
            font-size: 2rem;
            color: #4a5568;
            margin-bottom: 10px;
        }

        .login-header p {
            color: #718096;
            font-size: 0.9rem;
        }

        .login-form {
            position: relative;
            z-index: 1;
        }

        .form-group {
            margin-bottom: 20px;
            position: relative;
        }

        .form-group label {
            display: block;
            margin-bottom: 8px;
            color: #4a5568;
            font-weight: 500;
        }

        .form-control {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #e2e8f0;
            border-radius: 8px;
            font-size: 1rem;
            transition: all 0.3s ease;
            background-color: #f8fafc;
        }

        .form-control:focus {
            outline: none;
            border-color: #667eea;
            box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
        }

        .input-icon {
            position: absolute;
            right: 15px;
            top: 40px;
            color: #a0aec0;
        }

        .remember-forgot {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
            font-size: 0.9rem;
        }

        .remember-me {
            display: flex;
            align-items: center;
        }

        .remember-me input {
            margin-right: 8px;
        }

        .forgot-password {
            color: #667eea;
            text-decoration: none;
        }

        .forgot-password:hover {
            text-decoration: underline;
        }

        .login-btn {
            width: 100%;
            padding: 12px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 1rem;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
        }

        .login-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
        }

        .login-footer {
            text-align: center;
            margin-top: 25px;
            color: #718096;
            font-size: 0.9rem;
        }

        .register-link {
            color: #667eea;
            text-decoration: none;
            font-weight: 500;
        }

        .register-link:hover {
            text-decoration: underline;
        }

        .social-login {
            margin-top: 25px;
            text-align: center;
        }

        .social-login p {
            position: relative;
            color: #a0aec0;
            margin-bottom: 15px;
        }

        .social-login p::before,
        .social-login p::after {
            content: '';
            position: absolute;
            top: 50%;
            width: 30%;
            height: 1px;
            background: #e2e8f0;
        }

        .social-login p::before {
            left: 0;
        }

        .social-login p::after {
            right: 0;
        }

        .social-icons {
            display: flex;
            justify-content: center;
            gap: 15px;
        }

        .social-icon {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            background: #f8fafc;
            color: #4a5568;
            text-decoration: none;
            transition: all 0.3s ease;
            border: 1px solid #e2e8f0;
        }

        .social-icon:hover {
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }

        @keyframes pulse {
            0% {
                transform: rotate(0deg);
            }
            100% {
                transform: rotate(360deg);
            }
        }

        /* 响应式设计 */
        @media (max-width: 480px) {
            .login-container {
                padding: 30px 20px;
                margin: 0 15px;
            }

            .login-header h1 {
                font-size: 1.5rem;
            }
        }
    </style>
    <!-- 引入Font Awesome图标库 -->
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0-beta3/css/all.min.css">
</head>
<body>
<div class="login-container">
    <div class="login-header">
        <h1>欢迎回来</h1>
        <p>请输入您的账号和密码登录系统</p>
    </div>

    <form class="login-form">
        <div class="form-group">
            <label for="username">用户名</label>
            <input type="text" id="username" class="form-control" placeholder="请输入用户名" required>
            <i class="fas fa-user input-icon"></i>
        </div>

        <div class="form-group">
            <label for="password">密码</label>
            <input type="password" id="password" class="form-control" placeholder="请输入密码" required>
            <i class="fas fa-lock input-icon"></i>
        </div>

        <div class="remember-forgot">
            <div class="remember-me">
                <input type="checkbox" id="remember">
                <label for="remember">记住我</label>
            </div>
            <a href="#" class="forgot-password">忘记密码?</a>
        </div>

        <button type="submit" class="login-btn">登 录</button>
    </form>

    <div class="social-login">
        <p>其他登录方式</p>
        <div class="social-icons">
            <a href="#" class="social-icon"><i class="fab fa-weixin"></i></a>
            <a href="#" class="social-icon"><i class="fab fa-qq"></i></a>
            <a href="#" class="social-icon"><i class="fab fa-weibo"></i></a>
        </div>
    </div>

    <div class="login-footer">
        还没有账号? <a href="#" class="register-link">立即注册</a>
    </div>
</div>
</body>
</html>